[technical discussion on the IG, please]
Jerome Simeon <simeon@simeon-ltmh.research.bell-labs.com> writes:
> Can a local element belong to a substitution group?
>
> We can find nothing in Schema Part I that prohibits this, but if it is
> permitted, it is not clear what it would mean.
The Schema for Schemas rules this out:
<xs:complexType name="localElement">
<xs:complexContent>
<xs:restriction base="xs:element">
. . .
<xs:attribute name="substitutionGroup" use="prohibited"/>
^^^^^^^^^^^^^^^^
</xs:restriction>
</xs:complexContent>
</xs:complexType>
This only applies to the XML representation layer, of course.
It's a bug that there's no clause in "Schema Component Constraint:
Element Declaration Properties Correct" ruling this out for components
as well.
ht
--
Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
W3C Fellow 1999--2002, part-time member of W3C Team
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